Customary (adjective)

1. Usual; typical; normal; traditional.
2. Conventional; in accordance with established customs or practices.

Origin:

Late middle english: from old french coutumier, from coutume "custom".

Examples:

1. It was customary for the bride to wear white.
2. The customary way of greeting is to shake hands.
3. It was customary for the family to gather on Sundays.
4. It was customary for the guests to bring gifts.
5. The customary way of paying respects to the dead is to place flowers on the grave.